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0, 1, 3, 6, 30, 300, 2100, 11760, 105840, 1421280, 15634080, 147692160, 1919998080, 33106993920, 496604908800, 6638004172800, 112846070937600, 2386916704972800, 45351417394483200, 785383247480832000, 16493048197097472000, 413938002507853824000
(列表;图表;参考;听;历史;文本;内部格式)
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